Commit Graph

354 Commits

Author SHA1 Message Date
Tom Lane 5b3a2ca850 Dept of second thoughts: rename new perl script.
It didn't take long at all for me to become irritated that the original
choice of name for this script resulted in "warning" showing up in several
places in build logs, because I tend to grep for that.  Change the script
name to avoid that.
2017-02-19 16:41:51 -05:00
Tom Lane 65d508fd4d Suppress "unused variable" warnings with older versions of flex.
Versions of flex before 2.5.36 might generate code that results in an
"unused variable" warning, when using %option reentrant.  Historically
we've worked around that by specifying -Wno-error, but that's an
unsatisfying solution.  The official "fix" for this was just to insert a
dummy reference to the variable, so write a small perl script that edits
the generated C code similarly.

The MSVC side of this is untested, but the buildfarm should soon reveal
if I broke that.

Discussion: https://postgr.es/m/25456.1487437842@sss.pgh.pa.us
2017-02-19 13:04:30 -05:00
Tom Lane a029d2cf42 Document usage of COPT environment variable for adjusting configure flags.
Also add to the existing rather half-baked description of PROFILE,
which does exactly the same thing, but I think people use it differently.

Discussion: https://postgr.es/m/16461.1487361849@sss.pgh.pa.us
2017-02-17 16:11:02 -05:00
Tom Lane d2ab117616 Fix cross-shlib linking in temporary installs on HPUX 10.
Turns out this has been broken for years and we'd not noticed.  The one
case that was getting exercised in the buildfarm, or probably anywhere
else, was postgres_fdw.sl's reference to libpq.sl; and it turns out that
that was always going to libpq.sl in the actual installation directory
not the temporary install.  We'd not noticed because the buildfarm script
does "make install" before it tests contrib.  However, the recent addition
of a logical-replication test to the core regression scripts resulted in
trying to use libpqwalreceiver.sl before "make install" happens, and that
failed for lack of finding libpq.sl, as shown by failures on buildfarm
members gaur and pademelon.

There are two changes needed to fix it: the magic environment variable to
specify shlib search path at runtime is SHLIB_PATH not LD_LIBRARY_PATH,
and the shlib link command needs to specify the +s switch else the library
will not honor SHLIB_PATH.

I'm not quite sure why buildfarm members anole and gharial (HPUX 11) didn't
show the same failure.  Consulting man pages on the web says that HPUX 11
honors both LD_LIBRARY_PATH and SHLIB_PATH, which would explain half of it,
and the rather confusing wording I've been able to find suggests that +s
might effectively be the default in HPUX 11.  But it seems at least as
likely that there's just a libpq.so installed in /usr/lib on that machine;
as long as it's not too ancient, that would satisfy the test.  In any case
I do not think this patch will break HPUX 11.

At the moment I don't see a need to back-patch this, since it only matters
for testing purposes, not to mention that HPUX 10 is probably dead in the
real world anyway.
2017-01-21 15:15:39 -05:00
Heikki Linnakangas fe0a0b5993 Replace PostmasterRandom() with a stronger source, second attempt.
This adds a new routine, pg_strong_random() for generating random bytes,
for use in both frontend and backend. At the moment, it's only used in
the backend, but the upcoming SCRAM authentication patches need strong
random numbers in libpq as well.

pg_strong_random() is based on, and replaces, the existing implementation
in pgcrypto. It can acquire strong random numbers from a number of sources,
depending on what's available:

- OpenSSL RAND_bytes(), if built with OpenSSL
- On Windows, the native cryptographic functions are used
- /dev/urandom

Unlike the current pgcrypto function, the source is chosen by configure.
That makes it easier to test different implementations, and ensures that
we don't accidentally fall back to a less secure implementation, if the
primary source fails. All of those methods are quite reliable, it would be
pretty surprising for them to fail, so we'd rather find out by failing
hard.

If no strong random source is available, we fall back to using erand48(),
seeded from current timestamp, like PostmasterRandom() was. That isn't
cryptographically secure, but allows us to still work on platforms that
don't have any of the above stronger sources. Because it's not very secure,
the built-in implementation is only used if explicitly requested with
--disable-strong-random.

This replaces the more complicated Fortuna algorithm we used to have in
pgcrypto, which is unfortunate, but all modern platforms have /dev/urandom,
so it doesn't seem worth the maintenance effort to keep that. pgcrypto
functions that require strong random numbers will be disabled with
--disable-strong-random.

Original patch by Magnus Hagander, tons of further work by Michael Paquier
and me.

Discussion: https://www.postgresql.org/message-id/CAB7nPqRy3krN8quR9XujMVVHYtXJ0_60nqgVc6oUk8ygyVkZsA@mail.gmail.com
Discussion: https://www.postgresql.org/message-id/CAB7nPqRWkNYRRPJA7-cF+LfroYV10pvjdz6GNvxk-Eee9FypKA@mail.gmail.com
2016-12-05 13:42:59 +02:00
Peter Eisentraut 9ca7b0bf01 Allow individual TAP tests to be run via PROVE_TESTS
Add a new optional Makefile variable PROVE_TESTS that, if passed as a
space-separated list of paths relative to the Makefile invoking
$(prove_check) or $(prove_installcheck), runs just those tests instead
of t/*.pl .

From: Craig Ringer <craig@2ndquadrant.com>
Reviewed-by: Michael Paquier <michael.paquier@gmail.com>
2016-11-14 10:00:41 -05:00
Tom Lane 2b860f52ed Remove "sco" and "unixware" ports.
SCO OpenServer and SCO UnixWare are more or less dead platforms.
We have never had a buildfarm member testing the "sco" port, and
the last "unixware" member was last heard from in 2012, so it's
fair to doubt that the code even compiles anymore on either one.
Remove both ports.  We can always undo this if someone shows up
with an interest in maintaining and testing these platforms.

Discussion: <17177.1476136994@sss.pgh.pa.us>
2016-10-11 11:26:04 -04:00
Heikki Linnakangas d668b03378 Make TAP test suites to work, when @INC does not contain current dir.
Recent Perl and/or new Linux distributions are starting to remove "." from
the @INC list by default. That breaks pg_rewind and ssl test suites, which
use helper perl modules that reside in the same directory. To fix, add the
current source directory explicitly to prove's include dir.

The vcregress.pl script probably also needs something like this, but I
wasn't able to remove '.' from @INC on Windows to test this, and don't want
to try doing that blindly.

Discussion: <20160908204529.flg6nivjuwp5vaoy@alap3.anarazel.de>
2016-10-07 21:49:49 +03:00
Tom Lane 548af97fce Provide and use a makefile target to build all generated headers.
As of 9.6, pg_regress doesn't build unless storage/lwlocknames.h has been
created; but there was nothing forcing that to happen if you just went into
src/test/regress/ and built there.  We previously had a similar complaint
about plpython.

To fix in a way that won't break next time we invent a generated header,
make src/backend/Makefile expose a phony target for updating all the
include files it builds, and invoke that before building pg_regress or
plpython.  In principle, maybe we ought to invoke that everywhere; but
it would add a lot of usually-useless make cycles, so let's just do it
in the places where people have complained.

I made a couple of cosmetic adjustments in src/backend/Makefile as well,
to deal with the generated headers in consistent orders.

Michael Paquier and Tom Lane

Report: <31398.1467036827@sss.pgh.pa.us>
Report: <20150916200959.GB32090@msg.df7cb.de>
2016-07-01 15:09:02 -04:00
Tom Lane 588d963b00 Create src/fe_utils/, and move stuff into there from pg_dump's dumputils.
Per discussion, we want to create a static library and put the stuff into
it that until now has been shared across src/bin/ directories by ad-hoc
methods like symlinking a source file.  This commit creates the library and
populates it with a couple of files that contain the widely-useful portions
of pg_dump's dumputils.c file.  dumputils.c survives, because it has some
stuff that didn't seem appropriate for fe_utils, but it's significantly
smaller and is no longer referenced from any other directory.

Follow-on patches will move more stuff into fe_utils.

The Mkvcbuild.pm hacking here is just a best guess; we'll see how the
buildfarm likes it.
2016-03-24 15:55:57 -04:00
Andrew Dunstan 87cc6b57a9 Respect TEMP_CONFIG when pg_regress_check and friends are called
This reverts commit 9117985b6b in favor of
a more general solution.
2016-02-27 12:28:21 -05:00
Peter Eisentraut 7d17e683fc Add support for systemd service notifications
Insert sd_notify() calls at server start and stop for integration with
systemd.  This allows the use of systemd service units of type "notify",
which greatly simplifies the systemd configuration.

Reviewed-by: Pavel Stěhule <pavel.stehule@gmail.com>
2016-02-02 21:04:29 -05:00
Noah Misch 03a22f8b1d Make prove_installcheck remove the old log directory, if any.
prove_check already has been doing this.  Back-patch to 9.4, like the
commit that introduced this logging.
2015-10-11 20:36:07 -04:00
Robert Haas 45e5b4ef5c Don't try to create a temp install without abs_top_builddir.
Otherwise, we effectively act as if abs_top_builddir were the root
directory, which is quite dangerous if the user happens to have
permissions to do things there.  This can crop up in PGXS builds,
for example.

Report by Sandro Santilli, patch by me, review by Noah Misch.
2015-09-28 10:49:59 -04:00
Tom Lane a65e086453 Remove support for Unix systems without the POSIX signal APIs.
Remove configure's checks for HAVE_POSIX_SIGNALS, HAVE_SIGPROCMASK, and
HAVE_SIGSETJMP.  These APIs are required by the Single Unix Spec v2
(POSIX 1997), which we generally consider to define our minimum required
set of Unix APIs.  Moreover, no buildfarm member has reported not having
them since 2012 or before, which means that even if the code is still live
somewhere, it's untested --- and we've made plenty of signal-handling
changes of late.  So just take these APIs as given and save the cycles for
configure probes for them.

However, we can't remove as much C code as I'd hoped, because the Windows
port evidently still uses the non-POSIX code paths for signal masking.
Since we're largely emulating these BSD-style APIs for Windows anyway, it
might be a good thing to switch over to POSIX-like notation and thereby
remove a few more #ifdefs.  But I'm not in a position to code or test that.
In the meantime, we can at least make things a bit more transparent by
testing for WIN32 explicitly in these places.
2015-08-31 12:56:10 -04:00
Noah Misch 5da944fb46 Consolidate makefile code for setting top_srcdir, srcdir and VPATH.
Responsibility was formerly split between Makefile.global and pgxs.mk.
As a result of commit b58233c71b, in the
PGXS case, these variables were unset while parsing Makefile.global and
callees.  Inclusion of Makefile.custom did not work from PGXS, and the
subtle difference seemed like a recipe for future bugs.  Back-patch to
9.4, where that commit first appeared.
2015-07-30 20:48:41 -04:00
Heikki Linnakangas c7f0b28c7a Fix TAP tests with "make installcheck".
I neglected that the prove_installcheck rule also needs to also define
PG_REGRESS, like prove_check does.
2015-07-29 20:59:24 +03:00
Heikki Linnakangas 13d856e177 Make TAP tests work on Windows.
On Windows, use listen_address=127.0.0.1 to allow TCP connections. We were
already using "pg_regress --config-auth" to set up HBA appropriately. The
standard_initdb helper function now sets up the server's
unix_socket_directories or listen_addresses in the config file, so that
they don't need to be specified in the pg_ctl command line anymore. That
way, the pg_ctl invocations in test programs don't need to differ between
Windows and Unix.

Add another helper function to configure the server's pg_hba.conf to allow
replication connections. The configuration is done similarly to "pg_regress
--config-auth": trust on domain sockets on Unix, and SSPI authentication on
Windows.

Replace calls to "cat" and "touch" programs with built-in perl code, as
those programs don't normally exist on Windows.

Add instructions in the docs on how to install IPC::Run on Windows. Adjust
vcregress.pl to not replace PERL5LIB completely in vcregress.pl, because
otherwise cannot install IPC::Run in a non-standard location easily.

Michael Paquier, reviewed by Noah Misch, some additional tweaking by me.
2015-07-29 19:17:02 +03:00
Andrew Dunstan 01f6bb4b2d Make tap tests store postmaster logs and handle vpaths correctly
Given this it is possible that the buildfarm animals running these tests
will be able to capture adequate logging to allow diagnosis of failures.
2015-07-28 15:34:35 -04:00
Andrew Dunstan 16c33c50e1 Redirect install output of make check into a log file
dbf2ec1a changed make check so that the installation logs get directed
to stdout and stderr. Per discussion on -hackers, this patch restores
saving it to a file. It is now saved in /tmp_install/log, which is
created once per invocation of any make target doing regression tests.

Along the way, add a missing /log/ entry to test_ddl_deparse's
.gitignore.

Michael Paquier.
2015-07-23 09:44:20 -04:00
Heikki Linnakangas 1ea06203b8 Improve logging of TAP tests.
Create a log file for each test run. Stdout and stderr of the test script,
as well as any subprocesses run as part of the test, are redirected to
the log file. This makes it a lot easier to debug test failures. Also print
the test output (ok 12 - ... messages) to the log file, and the command
line of any external programs executed with the system_or_bail and run_log
functions. This makes it a lot easier to debug failing tests.

Modify some of the pg_ctl and other command invocations to not use 'silent'
or 'quiet' options, and don't redirect output to /dev/null, so that you get
all the information in the log instead.

In the passing, construct some command lines in a way that works if $tempdir
contains quote-characters. I haven't systematically gone through all of
them or tested that, so I don't know if this is enough to make that work.

pg_rewind tests had a custom mechanism for creating a similar log file. Use
the new generic facility instead.

Michael Paquier and me.
2015-07-09 13:19:10 +03:00
Tom Lane a5d489ccb7 Make numeric form of PG version number readily available in Makefiles.
Expose PG_VERSION_NUM (e.g., "90600") as a Make variable; but for
consistency with the other Make variables holding similar info,
call the variable just VERSION_NUM not PG_VERSION_NUM.

There was some discussion of making this value available as a pg_config
value as well.  However, that would entail substantially more work than
this two-line patch.  Given that there was not exactly universal consensus
that we need this at all, let's just do a minimal amount of work for now.

Michael Paquier, reviewed by Pavel Stehule
2015-07-02 17:24:36 -04:00
Bruce Momjian ea12b3ca8c doc build: use unique Makefile variable to control temp install 2015-05-12 12:30:50 -04:00
Bruce Momjian e8c19263e4 doc: prevent SGML 'make check' from building temp install
Report by Alvaro Herrera
2015-05-12 11:01:25 -04:00
Peter Eisentraut d664a10f96 Move interpreter shared library detection to configure
For building PL/Perl, PL/Python, and PL/Tcl, we need a shared library of
libperl, libpython, and libtcl, respectively.  Previously, this was
checked in the makefiles, skipping the PL build with a warning if no
shared library was available.  Now this is checked in configure, with an
error if no shared library is available.

The previous situation arose because in the olden days, the configure
options --with-perl, --with-python, and --with-tcl controlled whether
frontend interfaces for those languages would be built.  The procedural
languages were added later, and shared libraries were often not
available in the beginning.  So it was decided skip the builds of the
procedural languages in those cases.  The frontend interfaces have since
been removed from the tree, and shared libraries are now available most
of the time, so that setup makes much less sense now.

Also, the new setup allows contrib modules and pgxs users to rely on the
respective PLs being available based on configure flags.
2015-05-01 21:38:21 -04:00
Peter Eisentraut dbf2ec1a1c Fix parallel make risk with new check temp-install setup
The "check" target no longer needs to depend on "all", because it now
runs "install" directly, which in turn depends on "all".  Doing both
will cause problems with parallel make, because two builds will run next
to each other.

Also remove the redirection of the temp-install output into a log file.
This was appropriate when this was done from within pg_regress, but now
it's just a regular make run, and especially with the above changes this
will now take the place of running the "all" target before the test
suites.

problem report by Jeff Janes, patch in part by Michael Paquier
2015-04-29 20:34:22 -04:00
Peter Eisentraut 2aa0fb032e Fix shell error on Solaris
Apparently, the Bourne shell on Solaris doesn't like "for" loops with an
empty list, so have "make" skip the loop in that case.
2015-04-23 13:09:18 -04:00
Peter Eisentraut dcae5facca Improve speed of make check-world
Before, make check-world would create a new temporary installation for
each test suite, which is slow and wasteful.  Instead, we now create one
test installation that is used by all test suites that are part of a
make run.

The management of the temporary installation is removed from pg_regress
and handled in the makefiles.  This allows for better control, and
unifies the code with that of test suites not run through pg_regress.

review and msvc support by Michael Paquier <michael.paquier@gmail.com>

more review by Fabien Coelho <coelho@cri.ensmp.fr>
2015-04-23 08:59:52 -04:00
Heikki Linnakangas 3dc2d62d04 Use Intel SSE 4.2 CRC instructions where available.
Modern x86 and x86-64 processors with SSE 4.2 support have special
instructions, crc32b and crc32q, for calculating CRC-32C. They greatly
speed up CRC calculation.

Whether the instructions can be used or not depends on the compiler and the
target architecture. If generation of SSE 4.2 instructions is allowed for
the target (-msse4.2 flag on gcc and clang), use them. If they are not
allowed by default, but the compiler supports the -msse4.2 flag to enable
them, compile just the CRC-32C function with -msse4.2 flag, and check at
runtime whether the processor we're running on supports it. If it doesn't,
fall back to the slicing-by-8 algorithm. (With the common defaults on
current operating systems, the runtime-check variant is what you get in
practice.)

Abhijit Menon-Sen, heavily modified by me, reviewed by Andres Freund.
2015-04-14 17:05:03 +03:00
Andrew Dunstan 3f37b6c316 Fix installcheck case for tap tests 2014-12-24 10:31:36 -05:00
Noah Misch 40c598fa15 Fix previous commit for TAP test suites in VPATH builds.
Per buildfarm member crake.  Back-patch to 9.4, where the TAP suites
were introduced.
2014-12-18 01:24:57 -05:00
Noah Misch f6dc6dd5ba Lock down regression testing temporary clusters on Windows.
Use SSPI authentication to allow connections exclusively from the OS
user that launched the test suite.  This closes on Windows the
vulnerability that commit be76a6d39e
closed on other platforms.  Users of "make installcheck" or custom test
harnesses can run "pg_regress --config-auth=DATADIR" to activate the
same authentication configuration that "make check" would use.
Back-patch to 9.0 (all supported versions).

Security: CVE-2014-0067
2014-12-17 22:48:40 -05:00
Peter Eisentraut b58233c71b Fix PGXS vpath build when PostgreSQL is built with vpath
PGXS computes srcdir from VPATH, PostgreSQL proper computes VPATH from
srcdir, and doing both results in an error from make.  Conditionalize so
only one of these takes effect.
2014-12-04 17:02:02 -05:00
Peter Eisentraut 1e95bbc870 Fix SHLIB_PREREQS use in contrib, allowing PGXS builds
dblink and postgres_fdw use SHLIB_PREREQS = submake-libpq to build libpq
first.  This doesn't work in a PGXS build, because there is no libpq to
build.  So just omit setting SHLIB_PREREQS in this case.

Note that PGXS users can still use SHLIB_PREREQS (although it is not
documented).  The problem here is only that contrib modules can be built
in-tree or using PGXS, and the prerequisite is only applicable in the
former case.

Commit 6697aa2bc2 previously attempted to
address this by creating a somewhat fake submake-libpq target in
Makefile.global.  That was not the right fix, and it was also done in a
nonportable way, so revert that.
2014-12-04 07:58:12 -05:00
Peter Eisentraut a409b464f9 Add configure --enable-tap-tests option
Don't skip the TAP tests anymore when IPC::Run is not found.  This will
fail normally now.
2014-11-02 09:17:26 -05:00
Peter Eisentraut 5c3d830e44 Fix TAP tests with Perl 5.8
The prove program included in Perl 5.8 does not support the --ext
option, so don't use that and use wildcards on the command line instead.

Note that the tests will still all be skipped, because, for instance,
the version of Test::More is too old, but at least the regular
mechanisms for handling that will apply, instead of failing to call
prove altogether.
2014-10-26 09:47:01 -04:00
Noah Misch 53566fc094 MinGW: Link with shell32.dll instead of shfolder.dll.
This improves consistency with the MSVC build.  On buildfarm member
narwhal, since commit 846e91e022,
shfolder.dll:SHGetFolderPath() crashes when dblink calls it by way of
pqGetHomeDirectory().  Back-patch to 9.4, where that commit first
appeared.  How it caused this regression remains a mystery.  This is a
partial revert of commit 889f038129, which
adopted shfolder.dll for Windows NT 4.0 compatibility.  PostgreSQL 8.2
dropped support for that operating system.
2014-10-21 22:55:43 -04:00
Peter Eisentraut 5d93ce2d0c doc: Check DocBook XML validity during the build
Building the documentation with XSLT does not check the DTD, like a
DSSSL build would.  One can often get away with having invalid XML, but
the stylesheets might then create incorrect output, as they are not
designed to handle that.  Therefore, check the validity of the XML
against the DTD, using xmllint, during the build.

Add xmllint detection to configure, and add some documentation.

xmllint comes with libxml2, which is already in use, but it might be in
a separate package, such as libxml2-utils on Debian.

Reviewed-by: Fabien COELHO <coelho@cri.ensmp.fr>
2014-10-21 14:46:38 -04:00
Noah Misch 494affbd90 Fix quoting in the add_to_path Makefile macro.
The previous quoting caused "make -C src/bin check" to ignore, rather
than add to, any LD_LIBRARY_PATH content from the environment.
Back-patch to 9.4, where the macro was introduced.
2014-10-12 23:33:37 -04:00
Peter Eisentraut f7d6759ec2 Fix TAP checks when current directory name contains spaces
Add some quotes in the makefile snippet that creates the temporary
installation, so that it can handle spaces in the directory name and
possibly some other oddities.
2014-09-17 00:54:12 -04:00
Peter Eisentraut c2a01439c0 Run missing documentation tools through "missing"
Instead of just erroring out when a tool is missing, wrap the call with
the "missing" script that we are already using for bison, flex, and
perl, so that the users get a useful error message.
2014-09-13 20:22:21 -04:00
Peter Eisentraut 8632ba6de4 Support older versions of "prove"
Apparently, older versions of "prove" (couldn't identify the exact
version from the changelog) don't look into the t/ directory for tests
by default, so specify it explicitly.
2014-09-10 20:52:34 -04:00
Peter Eisentraut f669b61476 Set shared library path for in-tree TAP tests
When the TAP tests are run in-tree (make check), set the shared library
path using the appropriate environment variable, using a logic similar
to pg_regress, so that the right libraries are used.
2014-08-15 00:01:14 -04:00
Peter Eisentraut 0490db6287 Support vpath builds in TAP tests 2014-07-02 21:47:07 -04:00
Tom Lane b8cc8f9473 Support BSD and e2fsprogs UUID libraries alongside OSSP UUID library.
Allow the contrib/uuid-ossp extension to be built atop any one of these
three popular UUID libraries.  (The extension's name is now arguably a
misnomer, but we'll keep it the same so as not to cause unnecessary
compatibility issues for users.)

We would not normally consider a change like this post-beta1, but the issue
has been forced by our upgrade to autoconf 2.69, whose more rigorous header
checks are causing OSSP's header files to be rejected on some platforms.
It's been foreseen for some time that we'd have to move away from depending
on OSSP UUID due to lack of upstream maintenance, so this is a down payment
on that problem.

While at it, add some simple regression tests, in hopes of catching any
major incompatibilities between the three implementations.

Matteo Beccati, with some further hacking by me
2014-05-27 19:42:08 -04:00
Bruce Momjian 19fa6161dd build: add EXTRA_REGRESS_OPTS to all pg_regress invocations
Patch by Christoph Berg
2014-04-22 18:13:10 -04:00
Peter Eisentraut 0d3b2b80aa Have lcov call the right gcov
By default, lcov will call whatever gcov it can find in the path.  But
if the user has specified a different gcov to configure, this could be
incompatible.  So tell lcov explicitly with an option which gcov program
to call.
2014-04-14 21:52:03 -04:00
Peter Eisentraut e3fd932738 Add @configure_input@ marker to Makefile.global.in
That way, when looking at Makefile.global, we don't get confused by the
comment that claims that this is Makefile.global.in.
2014-04-14 21:49:57 -04:00
Peter Eisentraut 7d0f493f19 Add TAP tests for client programs
Reviewed-by: Pavel Stěhule <pavel.stehule@gmail.com>
Reviewed-by: Erik Rijkers <er@xs4all.nl>
2014-04-14 21:33:46 -04:00
Robert Haas b89e151054 Introduce logical decoding.
This feature, building on previous commits, allows the write-ahead log
stream to be decoded into a series of logical changes; that is,
inserts, updates, and deletes and the transactions which contain them.
It is capable of handling decoding even across changes to the schema
of the effected tables.  The output format is controlled by a
so-called "output plugin"; an example is included.  To make use of
this in a real replication system, the output plugin will need to be
modified to produce output in the format appropriate to that system,
and to perform filtering.

Currently, information can be extracted from the logical decoding
system only via SQL; future commits will add the ability to stream
changes via walsender.

Andres Freund, with review and other contributions from many other
people, including Álvaro Herrera, Abhijit Menon-Sen, Peter Gheogegan,
Kevin Grittner, Robert Haas, Heikki Linnakangas, Fujii Masao, Abhijit
Menon-Sen, Michael Paquier, Simon Riggs, Craig Ringer, and Steve
Singer.
2014-03-03 16:32:18 -05:00